titanium wrap is newer than the stuff I used on my 68 Camaro so I can’t say specifically but in my experience wrap tends to hold in moisture.
FWIW I have a downpipe blanket being developed now.
Haha, my ‘68 Camaro I had wrapped the primaries with a full encapsulated asbestos in coarse TI sleeve.
Install went perfect, started wrap at bottom & wrapped up to the head flange so all bottom edges faced down/away, SS zipties were plenty & not overtight, light brushing of pure silicone oil after wrap/before install (supposed to act like a water barrier) - your basic MUD O/C-d -approved type of install.
Long story short: - It looked like crap by 12K / ~7yrs installed.
At 12K you could see where the SS had burned out the nickel/pitting progressing down to 1/2 way from head flange to merge collector, so ~16” from head.
I was O/C-D putting up in winter, knew all the tricks like motor cleaning was done by hand/ rags & spray bottles, no pressure washer/garden hose ever, ran motor well past self-cleaning temps to avoid any condensation.
Never drove it in downpour rain, maybe drove <30x total on roads that were anything but bone dry, never enough water to spray off the tires on the highway.
Headers were a longtube but budget-friendly set of entry Hookers, weren’t that cheap Chineseium type SS, they were polished decent stuff.
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I recently spoke with a sprint car motor builder who builds Outlaw -type that run on clay tracks, he used wrap “back when” but now is 100% in favor of ceramic coating esp when tracks are still green & slinging clay mud.
If I were to do anything for heat mitigation, ceramic coating is the only way for any of us not down in the SW region.
You just can’t win with wrap in the PNW, at least IME.
———Link the local guy sent me later after we talked - I’d only skimmed it but seemed like it was solid evidence for ceramic coating:
Why Header Wraps Destroy Your Headers, and Why Thermal Ceramic Header Coatings are Recommended.
www.centuryperformance.com